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CSharp Fundamentals

The course teaches C# basics—types, variables, control flow, methods, properties, OOP concepts, collections, and LINQ fundamentals—enabling learners to write clean, maintainable code and transition smoothly into .NET development.

Who Should Take This

Junior developers, recent CS graduates, or programmers switching to C# from Java, Python, or JavaScript benefit from this course. It targets individuals with basic programming knowledge who want to master core language constructs, object‑oriented design, and introductory LINQ to build robust applications.

What's Included in AccelaStudy® AI

Adaptive Knowledge Graph
Practice Questions
Lesson Modules
Console Simulator Labs
Exam Tips & Strategy
20 Activity Formats

Course Outline

61 learning goals
1 Types & Variables
4 topics

Value types and reference types

  • Identify the built-in value types (int, double, bool, char, decimal, byte, long) and explain how they differ from reference types in terms of memory allocation on the stack versus the heap.
  • Describe the behavior of reference types including string, object, and arrays, and explain reference equality versus value equality semantics.
  • Implement implicit and explicit type conversions, casting operations, and the Convert class to safely transform data between numeric types and strings.

Nullable types and type inference

  • Explain nullable value types (int?) and nullable reference types, including the null-coalescing (??) and null-conditional (?.) operators.
  • Implement var and target-typed new expressions to leverage type inference while maintaining code readability and type safety.

Strings and constants

  • Describe string immutability, string interpolation with $ syntax, verbatim strings with @, raw string literals, and common string methods (Substring, Split, Trim, Replace).
  • Implement StringBuilder for efficient string concatenation in loops and compare its performance characteristics against repeated string concatenation.
  • Explain the difference between const and readonly fields, and describe when to use each for compile-time versus runtime constants.

Enums and tuples

  • Implement enum types with explicit underlying values and the [Flags] attribute, and apply Enum.Parse and Enum.TryParse for string-to-enum conversion.
  • Implement named and unnamed tuples as lightweight data carriers and use tuple deconstruction to extract individual elements.
2 Control Flow
3 topics

Conditional statements

  • Implement if/else if/else chains and ternary conditional expressions to branch program logic based on boolean conditions.
  • Implement switch statements and switch expressions with pattern matching including type patterns, property patterns, and relational patterns.
  • Analyze complex branching scenarios to determine the most readable and maintainable approach among if/else chains, switch expressions, and pattern matching.

Loops and iteration

  • Identify the four loop constructs (for, foreach, while, do-while) and describe when each is most appropriate based on the iteration pattern.
  • Implement nested loops with break, continue, and return statements to control iteration flow in multi-dimensional data processing.
  • Compare the performance and readability trade-offs between traditional for loops and foreach iteration over arrays and lists.

Pattern matching

  • Describe the pattern matching features in C# 12 including declaration patterns, constant patterns, var patterns, and list patterns.
  • Implement is-expressions and switch expressions with when guards to perform type checking and value extraction in a single operation.
3 Methods & Properties
3 topics

Method declaration and parameters

  • Identify method signatures including return types, access modifiers, static versus instance methods, and the void return type.
  • Implement methods using ref, out, and in parameter modifiers and explain pass-by-value versus pass-by-reference semantics for value and reference types.
  • Implement methods with optional parameters, params arrays, and named arguments to create flexible and readable method signatures.
  • Analyze method overloading scenarios to determine the correct overload resolution rules the compiler applies when multiple candidates exist.

Properties and expression-bodied members

  • Describe auto-implemented properties, get/set/init accessors, and computed properties, and explain how they encapsulate backing fields.
  • Implement expression-bodied members for methods, properties, and constructors to write concise single-expression implementations.
  • Implement indexers and operator overloading to provide natural syntax for custom collection-like types.

Local functions and delegates

  • Implement local functions and static local functions to encapsulate helper logic within a method scope.
  • Describe the delegate types Action, Func, and Predicate, and explain how lambda expressions provide inline implementations of delegate signatures.
  • Analyze scenarios where lambda expressions, local functions, and named methods each provide the clearest and most maintainable solution.
4 Object-Oriented Programming
4 topics

Classes and structs

  • Describe classes, structs, and record types including their memory semantics, default equality behavior, and when to choose each.
  • Implement constructors including parameterized constructors, constructor chaining with this(), static constructors, and primary constructors in C# 12.
  • Implement record types with positional syntax and with-expressions for immutable data modeling.
  • Compare classes, structs, and records to determine the appropriate type for given scenarios based on mutability, equality, and allocation requirements.

Inheritance and polymorphism

  • Describe single inheritance, the base keyword, virtual/override/new method modifiers, and how the runtime dispatches virtual method calls.
  • Implement abstract classes with abstract and virtual members to define extensible base types with both required and optional overrides.
  • Implement sealed classes and sealed override methods to prevent further inheritance and override in class hierarchies.
  • Analyze polymorphism scenarios to determine when to use abstract classes versus interfaces and when hiding (new) versus overriding (override) is appropriate.

Interfaces and encapsulation

  • Describe interfaces including multiple interface implementation, default interface methods, and explicit interface implementation.
  • Implement interfaces to define contracts and apply common patterns such as IDisposable, IComparable, and IEquatable.
  • Explain access modifiers (public, private, protected, internal, protected internal, private protected) and describe how encapsulation protects internal state.
  • Evaluate interface design decisions including interface segregation, default interface methods versus abstract base classes, and explicit versus implicit implementation.

Generics fundamentals

  • Describe generic type parameters, generic classes, and generic methods including how they enable type-safe reusable code without boxing.
  • Implement generic constraints (where T : class, struct, new(), IInterface, BaseClass) to restrict type parameters and enable member access.
  • Analyze scenarios to determine when generic types, generic methods, or non-generic alternatives provide the best balance of reusability and simplicity.
5 Collections & LINQ Basics
3 topics

Built-in collections

  • Identify the generic collection types List, Dictionary, HashSet, Queue, and Stack, and describe their underlying data structures and performance characteristics.
  • Implement collection initialization using collection expressions, Add methods, and collection initializer syntax in C# 12.
  • Compare List, LinkedList, and arrays to select the optimal collection for insertion-heavy, random-access, and fixed-size scenarios.

LINQ query and method syntax

  • Describe the LINQ execution model including deferred versus immediate execution, IEnumerable versus IQueryable, and the role of iterator methods.
  • Implement LINQ queries using both query syntax (from/where/select) and method syntax (Where, Select, OrderBy, GroupBy) with lambda expressions.
  • Implement LINQ aggregation operations (Count, Sum, Average, Min, Max, Aggregate) and element operations (First, Single, ElementAt) with their OrDefault variants.
  • Analyze LINQ query chains to identify performance pitfalls such as multiple enumeration, unnecessary materialization, and N+1 query patterns.

Arrays and spans

  • Implement single-dimensional, multi-dimensional, and jagged arrays and apply Array class methods (Sort, Reverse, Find, BinarySearch).
  • Describe the Range and Index types, and use the hat operator (^) and range operator (..) for slicing arrays and strings.
6 Exception Handling & File I/O
3 topics

Exception handling mechanics

  • Describe the exception hierarchy from System.Exception, the try/catch/finally block structure, and the when exception filter clause.
  • Implement custom exception classes that inherit from Exception or ApplicationException and include meaningful messages and inner exceptions.
  • Evaluate exception handling strategies to determine when to catch, wrap, rethrow, or let exceptions propagate up the call stack.

Resource management

  • Explain the IDisposable pattern, the using statement, and using declarations for deterministic resource cleanup of file handles, streams, and connections.
  • Implement the IDisposable pattern in a custom class with both managed and unmanaged resource cleanup including a finalizer.

File and stream I/O

  • Identify the File, Directory, Path, StreamReader, and StreamWriter classes and describe their roles in reading and writing text files.
  • Implement file read and write operations using StreamReader, StreamWriter, and File convenience methods (ReadAllText, WriteAllLines) with proper using statements.
  • Implement JSON serialization and deserialization using System.Text.Json to convert objects to and from JSON strings and files.
  • Analyze file I/O error scenarios including FileNotFoundException, IOException, and permission errors to implement robust file processing with appropriate error recovery.

Scope

Included Topics

  • C# 12 language fundamentals on .NET 8: value types, reference types, nullable types, type conversions, variables, constants, and string interpolation.
  • Control flow constructs including if/else, switch expressions, pattern matching, for/foreach/while/do-while loops, and jump statements.
  • Methods, properties, indexers, operator overloading, ref/out/in parameters, optional parameters, and expression-bodied members.
  • Object-oriented programming: classes, structs, records, interfaces, abstract classes, inheritance, polymorphism, encapsulation, and sealed/static modifiers.
  • Collections (List, Dictionary, HashSet, Queue, Stack), LINQ query syntax and method syntax, lambda expressions, and deferred execution.
  • Exception handling with try/catch/finally/when, custom exceptions, file I/O with StreamReader/StreamWriter, and using/await using for resource management.

Not Covered

  • ASP.NET Core, Blazor, and any web framework patterns.
  • Entity Framework Core and database access layers.
  • WPF, WinForms, MAUI, and any UI framework.
  • Advanced concurrency (async/await, Task Parallel Library, channels) beyond basic understanding.
  • Unsafe code, pointers, Span, and low-level memory management.
  • NuGet package authoring, MSBuild customization, and CI/CD pipeline configuration.

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